I use Shoutcast for years. Now I migrate the service from one my server to my another one. Freshly installed DNAS works fine, but - Authhash Management tab doesn't accept the Authhash I've been using on another server.

For test purposes I've created I new radiostation and its Authhhash was well-accepted (and this new one is longer, than the "old" one I've been using).
Is there any way how I can use the Authhash on freshly installed version?
NB. When I push "Re-generate Authhash" it returns "Error occured" without any other notices. Tried on different browsers.